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Ethics and the Law at the Live-in Lab

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Wellness and wellbeing social and emotional


Biomechanical analyses of flywheel resistance exercise: From a space- and ground-based perspective

PhD book

Video of the defence

Abstract [en]

Astronauts suffer degradation of postural muscles and weight-bearing bones during long-duration spaceflight. Resistance exercise is used as a primary countermeasure against these degradations. However, it has proven difficult to predict appropriate exercise loads, and the countermeasure regimens in current use are not fully preventing bone and muscle loss. It is likely that gravity-independent exercise devices, based on flywheel inertial resistance, will be implemented in future musculoskeletal countermeasure regimens.
In this thesis, biomechanical analyses of external and internal exercise loads during flywheel leg resistance exercises, were performed through experimental data collection and musculoskeletal modelling. The thesis is based on four separate studies with the collective aim to provide knowledge that can be implemented when designing flywheel-based strength-training regimens to be used both in terrestrial settings and as countermeasures against musculoskeletal deconditioning in weightlessness.
The first study analyzed computed joint kinematics and kinetics, and relative muscle forces in the lower limb during maximal effort flywheel leg press (FWLP) and flywheel squat (FWS) exercises. Results showed that total exercise load was slightly higher during FWS than FWLP, whereas relative muscle force did not differ between the two exercises, suggesting that they may have similar strength training effects.
The second study investigated the effect of gravity on internal joint load distribution during leg resistance exercise. This was done in two steps: 1) by comparing joint kinetics during FWLP and FWS at a given submaximal exercise load (80% of the isometric maximum load in FWLP), and 2) by simulating both FWLP and FWS in zero gravity and studying changes in joint loads. The first step revealed greater hip extension moment and lumbar joint-contact forces in FWLP than in FWS, indicating a notable effect of the direction of motion relative to the gravity vector, on body load distribution. Step two showed similar, or lower, joint loads in FWLP when gravity was removed, whereas in FWS, removal of gravity resulted in increased hip extension moment and lumbar force. Collectively, the results suggest that FWLP is a better ground-based analogue than FWS for leg-resistance exercise in space.
The third study examined the accuracy of a pressure insole system regarding measurements of centre of pressure and ground reaction force during resistance exercises. The results showed that insoles are capable of accurately measuring centre of pressure at loads higher than 250 N and that force measurements are accurate in exercises involving mainly vertical ground reaction forces, but appears to overestimate ground reaction force for exercises involving greater portions of shear force.
The fourth study analyzed low-back loads during FWLP, FWS and barbell back squat. Lumbar compression forces were high and similar in the three exercises, suggesting that the flywheel exercises are capable of stimulating vertebral bone regeneration without inflicting risk of vertebral fractures. Muscle engagement in the investigated back extensors were lower in FWLP than in the other two exercises, although presumed high enough to counteract space-induced atrophy if implemented in countermeasure training regimens.

Ethics of AI Use in the Public Sector

Ethics of AI Use in the Public Sector.pdf
792 kB
The ethics of AI in the public sector covers a broad range of issues of privacy and security, transparency, legitimacy and fairness. With AI and automated decision-making being implemented as part of the decision-making process on local level, there has been a rise in interest regarding the consequences of such new systems.
Date: June 9th 2021, on Zoom
Time: 09.00-16.00, a schedule will follow shortly.
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This workshop will feature talks on the topics of governance of artificial intelligence, political implications of ethics in the discussion of AI use, an overview of AI’s adoption as well as on the ethics of automated criminal sentencing, conflicting norms and values in the case of Project Maven and corporeal ethics in interaction design practice, among others.The workshop has been co-funded by the KTH Digitalization platform.

Registration

Questions?

Contact

Maria Nordström
The workshop is free and open for all. A Zoom-link will be sent out a couple of days prior to the workshop.

Speakers

, The Alan Turing Institute,
and , Institute for Futures Studies
, KTH
, Stockholm University
, KTH
, Swedish Defense University
, KTH
, Karlstad University
, Stockholm University
Patrick Eckemo, advisor, Agency for Digital Government (DIGG)


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